Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast

Four Chilean sandy beaches were sampled during the summer of 2000, to study the role of stranded algal wrack deposits on the population abundances of three detritus feeder species of the macroinfauna that inhabit the upper shore levels of that beaches: the talitrid amphipod Orchestoidea tuberculata...

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Autores principales:	JARAMILLO,EDUARDO, HUZ,ROSARIO DE LA, DUARTE,CRISTIAN, CONTRERAS,HERALDO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2006
Materias:	algal wrack deposits sandy beach arthropods Chilean coast
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000300006
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spelling	oai:scielo:S0716-078X20060003000062006-10-03Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coastJARAMILLO,EDUARDOHUZ,ROSARIO DE LADUARTE,CRISTIANCONTRERAS,HERALDO algal wrack deposits sandy beach arthropods Chilean coast Four Chilean sandy beaches were sampled during the summer of 2000, to study the role of stranded algal wrack deposits on the population abundances of three detritus feeder species of the macroinfauna that inhabit the upper shore levels of that beaches: the talitrid amphipod Orchestoidea tuberculata Nicolet, the tylid isopod Tylos spinulosus Dana and the tenebrionid insect Phalerisida maculata Kulzer. The beaches were Apolillado (ca. 29° S), Quidico (ca. 38° S), Guabún and Mar Brava (ca. 42° S). Replicated samples were collected with a plastic cylinder (25 cm in diameter) from algal wrack deposits including the sediments beneath the wrack and nearby bare sand areas. Samples were collected at two beach levels, one closer to the sea with fresh deposits and other located on the upper beach with dry alga. Algal wrack deposits were mostly composed of the brown algae Macrocystis pyrifera (L.), Durvillaea antarctica (Chamisso) Hariot and Lessonia nigrescens Bory. O. tuberculata was found in the algal wrack deposits and bare sands collected from Apolillado, Quidico, Guabún and Mar Brava. On the other hand, T. spinulosus was just found at Apolillado, while P. maculata occurred in the sands beneath algal wrack deposits and bare sands collected from Apolillado, Quidico and Guabún. In general, the mean abundances of O. tuberculata, P. maculta and T. spinulosus were significantly higher in those samples collected from sands beneath algal wrack deposits; i.e., 56, 61 and 14 times higher (overall means) than in bare sands, respectively. It is concluded that stranded algal wrack deposits indeed promote an increase in population abundances of sandy beach detritus feeders, either because that deposits provide their main food source or shelter against variable environmental conditions (e.g., air temperature and humidity) during daylight hours. That might well explain the patchiness shown by these organisms, either across or along shore. This conclusion has important implications for sampling design of sandy beaches characterized by high inputs of algal wrack depositsinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.79 n.3 20062006-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000300006en10.4067/S0716-078X2006000300006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	algal wrack deposits sandy beach arthropods Chilean coast
spellingShingle	algal wrack deposits sandy beach arthropods Chilean coast JARAMILLO,EDUARDO HUZ,ROSARIO DE LA DUARTE,CRISTIAN CONTRERAS,HERALDO Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast
description	Four Chilean sandy beaches were sampled during the summer of 2000, to study the role of stranded algal wrack deposits on the population abundances of three detritus feeder species of the macroinfauna that inhabit the upper shore levels of that beaches: the talitrid amphipod Orchestoidea tuberculata Nicolet, the tylid isopod Tylos spinulosus Dana and the tenebrionid insect Phalerisida maculata Kulzer. The beaches were Apolillado (ca. 29° S), Quidico (ca. 38° S), Guabún and Mar Brava (ca. 42° S). Replicated samples were collected with a plastic cylinder (25 cm in diameter) from algal wrack deposits including the sediments beneath the wrack and nearby bare sand areas. Samples were collected at two beach levels, one closer to the sea with fresh deposits and other located on the upper beach with dry alga. Algal wrack deposits were mostly composed of the brown algae Macrocystis pyrifera (L.), Durvillaea antarctica (Chamisso) Hariot and Lessonia nigrescens Bory. O. tuberculata was found in the algal wrack deposits and bare sands collected from Apolillado, Quidico, Guabún and Mar Brava. On the other hand, T. spinulosus was just found at Apolillado, while P. maculata occurred in the sands beneath algal wrack deposits and bare sands collected from Apolillado, Quidico and Guabún. In general, the mean abundances of O. tuberculata, P. maculta and T. spinulosus were significantly higher in those samples collected from sands beneath algal wrack deposits; i.e., 56, 61 and 14 times higher (overall means) than in bare sands, respectively. It is concluded that stranded algal wrack deposits indeed promote an increase in population abundances of sandy beach detritus feeders, either because that deposits provide their main food source or shelter against variable environmental conditions (e.g., air temperature and humidity) during daylight hours. That might well explain the patchiness shown by these organisms, either across or along shore. This conclusion has important implications for sampling design of sandy beaches characterized by high inputs of algal wrack deposits
author	JARAMILLO,EDUARDO HUZ,ROSARIO DE LA DUARTE,CRISTIAN CONTRERAS,HERALDO
author_facet	JARAMILLO,EDUARDO HUZ,ROSARIO DE LA DUARTE,CRISTIAN CONTRERAS,HERALDO
author_sort	JARAMILLO,EDUARDO
title	Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast
title_short	Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast
title_full	Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast
title_fullStr	Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast
title_full_unstemmed	Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast
title_sort	algal wrack deposits and macroinfaunal arthropods on sandy beaches of the chilean coast
publisher	Sociedad de Biología de Chile
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000300006
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Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast

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